shill: Support raw PEM data for CA Certificates

For all connection types that support CA Certificates (L2TP-IPSec,
OpenVPN, 802.1x WiFi) support a Service property that contains the
raw contents of the PEM certificate to be used in authenticating
the remote entity.

BUG=chromium-os:39685
TEST=Unit tests; Manual: Set the EAP.CACertPEM property on a
service and ensure that the data is stored and retrieved from
the profile correctly with newlines intact.

Change-Id: I4adc850dbb38a8b9afb55fc40260d67bcaa33485
Reviewed-on: https://gerrit.chromium.org/gerrit/45642
Commit-Queue: Paul Stewart <pstew@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
diff --git a/mock_certificate_file.cc b/mock_certificate_file.cc
new file mode 100644
index 0000000..9cfcf7e
--- /dev/null
+++ b/mock_certificate_file.cc
@@ -0,0 +1,13 @@
+// Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "shill/mock_certificate_file.h"
+
+namespace shill {
+
+MockCertificateFile::MockCertificateFile() : CertificateFile(NULL) {}
+
+MockCertificateFile::~MockCertificateFile() {}
+
+}  // namespace shill